生活中的下列现象，用分子的相关知识解释不正确的是（）          

下列关于人口问题的叙述正确的是（    ）

根据短文理解，选择正确答案。

In a Station of the Metro

    The apparition of these faces in the crowd;Petals on a wet, black bough.

    This is the only Ezra Pound poem that many people will read in their lives. Why? One obvious reason is that it's just two lines long. The poem, which can be understood as “A man sees a bunch of faces in the subway and thinks they look like flowers on a tree branch,” is an exercise in shortness. Pound wrote it after having a spiritual experience in a Paris metro (subway) station.

    In 1916, the US poet originally thought he could best describe his vision in a painting. Unfortunately, he wasn't a painter. So he wrote a thirty-line poem, which he didn't like. He dropped the long version in the waste bin. Six months later, he wrote a shorter poem, but didn't like that one either. Finally, a full year after the experience, he had been reading short Japanese poems called haikus, and he figured he would try this style. The result, which was published in 1913, is one of the most famous and influential works in modern poetry.

    This poem is one of the monuments (纪念物) of the 20th-century artistic movement known as “Imagism”. Basically, Pound and his friends thought that images (意象) weren't just decoration: they were the highest form of speech. By finding the right image, the poet can express the true, spiritual reality of a thing, which is more important than using a bunch of adjectives to describe its physical appearance. Thus, “In a Station of the Metro” is a poem that consists of one image expressed with absolute (绝对的) exactness and nothing else.

    To the imagists, the best way to describe an experience is not to use more and more words; the best way is to find exactly the right words. Have you ever told a beloved one that “words can't express” how much you love them? Well, Pound would say that you're just being lazy. In his view, words can express anything, even if it takes an entire year to find the right ones.

   Ellen Parker was worried about her health. She could not walk very quickly and it was difficult for her to climb stars. She was soon out of breath (气喘吁吁).
   “I suppose I had better go to the doctor,” she thought.
   She went to the doctor and told him her problem.
   “I'm not surprised at all,” he said. “It's obvious what your problem is.”He looked her over then gave her some advice.“If you don't do what I say, Mrs. Parker," he said, "you will have a heart attack. It could kill you.”
   Ellen Parker was very worried as she left the doctor's. She knew that she had to take his advice but it would not be easy and it would take time.
   The next day she went shopping. The first shop she went into was a butcher's shop (肉铺).“I'd like ten pounds of steak (牛排), please,” she said.“Certainly, madam,” the butcher replied and went into the cold room and found a large piece of steak. He brought the huge piece of meat back into the shop and put it on the scale (天平).
   “That's just under ten pounds,"he said.
   “That big enough," Mrs. Parker said.
   The butcher worked out the price.
   “At $4.99 a pound that will be $49.50, please. Would you like me to cut it up into smaller pieces for you?”
   “Oh, I don't want to buy the meat,"Mrs. Parker said.
   “If you don't want to buy it," the butcher replied angrily, "why did you ask me to get it for you?”
   “My doctor told me that I am over-weight and I have to lose ten pounds. I wanted to see what ten pounds of meat looked like.”